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      <a href="/2017/03/05/angular-free-9-event-callback-queue/" title="玩转Angular1(9)--按键事件队列KeyUp服务" itemprop="url">玩转Angular1(9)--按键事件队列KeyUp服务</a>
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    <time datetime="2017-03-05T03:42:32.000Z" itemprop="datePublished">2017-03-05</time>
    更新日期:<time datetime="2018-12-18T15:26:32.518Z" itemprop="dateModified">2018-12-18</time>
    
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			<strong class="toc-title">文章目录</strong>
		<ol class="toc"><li class="toc-item toc-level-2"><a class="toc-link" href="#基本思路"><span class="toc-number">1.</span> <span class="toc-text">基本思路</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#提供队列注册事件"><span class="toc-number">1.1.</span> <span class="toc-text">提供队列注册事件</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#注册监听事件"><span class="toc-number">1.2.</span> <span class="toc-text">注册监听事件</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#执行回调，并销毁注册"><span class="toc-number">1.3.</span> <span class="toc-text">执行回调，并销毁注册</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#KeyUp服务代码"><span class="toc-number">2.</span> <span class="toc-text">KeyUp服务代码</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#KeyUp-ts"><span class="toc-number">2.1.</span> <span class="toc-text">KeyUp.ts</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#在控制器中使用"><span class="toc-number">2.2.</span> <span class="toc-text">在控制器中使用</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#结束语"><span class="toc-number">3.</span> <span class="toc-text">结束语</span></a></li></ol>
		</div>
		
		<p>AngularJS(v1.5.8)已经成为项目们的基本框架，《玩转Angular1》系列用于记录项目中的一些好玩或者比较特别的思路。<br>本文简单介绍创建一个事件队列，来监听按键，并进行回调处理的过程。<br><a id="more"></a></p>
<h2 id="基本思路"><a href="#基本思路" class="headerlink" title="基本思路"></a>基本思路</h2><hr>
<h3 id="提供队列注册事件"><a href="#提供队列注册事件" class="headerlink" title="提供队列注册事件"></a>提供队列注册事件</h3><p>通常，我们会需要在控制器中直接添加这样的按键监听事件，故这里我们通过服务的方式进行。</p>
<p>我们需要提供一个注册函数，来给控制器调用，需要传入：</p>
<ul>
<li>scope：作用域，用于提供执行环境</li>
<li>callback：回调函数</li>
</ul>
<p>因此，我们的注册服务的使用应该是这样的：</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div></pre></td><td class="code"><pre><div class="line"><span class="comment">// 添加Esc按键事件</span></div><div class="line">EscKeyUp($scope, () =&gt; &#123; callback(); &#125;);</div></pre></td></tr></table></figure>
<p>我们可以提供一个缓存对象，里面通过随机产生的uuid来绑定<code>{scope, callback}</code>数据。</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div></pre></td><td class="code"><pre><div class="line"><span class="comment">// 添加按键事件队列</span></div><div class="line">addCallback(callbacks, scope, callback) &#123;</div><div class="line">    <span class="comment">// 产生随机数</span></div><div class="line">    <span class="keyword">const</span> uuid = <span class="built_in">Math</span>.random().toString(<span class="number">36</span>).substr(<span class="number">2</span>);</div><div class="line">    <span class="comment">// 需有回调函数</span></div><div class="line">    <span class="keyword">if</span> (<span class="keyword">typeof</span> callback !== <span class="string">'function'</span>) &#123;</div><div class="line">        <span class="built_in">console</span>.log(<span class="string">'callback is not a function.'</span>);</div><div class="line">        <span class="keyword">return</span>;</div><div class="line">    &#125;</div><div class="line">    <span class="comment">// 关联uuid的作用域和回调</span></div><div class="line">    <span class="keyword">this</span>.CallbackObjscts[uuid] = &#123; scope, callback &#125;;</div><div class="line">    <span class="comment">// 添加到队列的头部</span></div><div class="line">    callbacks.unshift(uuid);</div><div class="line">    <span class="comment">// 初始化监听事件</span></div><div class="line">    <span class="keyword">if</span> (!<span class="keyword">this</span>.isEventInit) &#123;</div><div class="line">        <span class="keyword">this</span>.initEvent();</div><div class="line">        <span class="keyword">this</span>.isEventInit = <span class="literal">true</span>;</div><div class="line">    &#125;</div><div class="line">&#125;</div></pre></td></tr></table></figure>
<p>可以看到，除了scope和callback，还需传入队列数组，该队列我们针对按键来分：</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div></pre></td><td class="code"><pre><div class="line"><span class="comment">// Esc按键队列</span></div><div class="line">EscCallbacks = [];</div><div class="line"><span class="comment">// Space按键队列</span></div><div class="line">SpaceCallbacks = [];</div></pre></td></tr></table></figure>
<h3 id="注册监听事件"><a href="#注册监听事件" class="headerlink" title="注册监听事件"></a>注册监听事件</h3><p>我们需要在文档添加事件监听：</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div></pre></td><td class="code"><pre><div class="line"><span class="comment">// 监听按键事件</span></div><div class="line">initEvent() &#123;</div><div class="line">    <span class="keyword">const</span> that = <span class="keyword">this</span>;</div><div class="line">    <span class="comment">// 添加按键事件监听</span></div><div class="line">    <span class="built_in">document</span>.addEventListener(<span class="string">'keyup'</span>, (<span class="function">(<span class="params">e = (<span class="built_in">window</span> <span class="keyword">as</span> MyWindow</span>).<span class="params">event</span> <span class="params">as</span> <span class="params">any</span>) =&gt;</span> &#123;</div><div class="line">        <span class="keyword">if</span> (e &amp;&amp; e.keyCode) &#123;</div><div class="line">            <span class="keyword">switch</span> (e.keyCode) &#123;</div><div class="line">                <span class="keyword">case</span> <span class="number">27</span>:</div><div class="line">                    <span class="comment">// Esc按键事件</span></div><div class="line">                    that.executeCallback(that.EscCallbacks);</div><div class="line">                    <span class="keyword">break</span>;</div><div class="line">                <span class="keyword">case</span> <span class="number">32</span>:</div><div class="line">                    <span class="comment">// Space按键事件</span></div><div class="line">                    that.executeCallback(that.SpaceCallbacks);</div><div class="line">                    <span class="keyword">break</span>;</div><div class="line">            &#125;</div><div class="line">        &#125;</div><div class="line">    &#125;).bind(<span class="keyword">this</span>), <span class="literal">true</span>);</div><div class="line">&#125;</div></pre></td></tr></table></figure>
<h3 id="执行回调，并销毁注册"><a href="#执行回调，并销毁注册" class="headerlink" title="执行回调，并销毁注册"></a>执行回调，并销毁注册</h3><p>当按键事件触发时，我们需要：</p>
<ul>
<li>取出队列头部回调，并执行</li>
<li>注销缓存对象及其引用</li>
</ul>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div></pre></td><td class="code"><pre><div class="line"><span class="comment">// 执行回调队列</span></div><div class="line">executeCallback(callbacks) &#123;</div><div class="line">    <span class="keyword">if</span> (!callbacks.length) &#123; <span class="keyword">return</span>; &#125;</div><div class="line">    <span class="comment">// 获取队列头部uuid</span></div><div class="line">    <span class="keyword">const</span> uuid = callbacks.shift();</div><div class="line">    <span class="comment">// 取出uuid关联的对象缓存</span></div><div class="line">    <span class="keyword">const</span> &#123;scope, callback&#125; = <span class="keyword">this</span>.CallbackObjscts[uuid] <span class="keyword">as</span> any;</div><div class="line">    <span class="comment">// 执行回调</span></div><div class="line">    scope.$apply(callback());</div><div class="line">    <span class="comment">// 移除和注销</span></div><div class="line">    <span class="keyword">this</span>.CallbackObjscts.splice(<span class="keyword">this</span>.CallbackObjscts.findIndex(<span class="function"><span class="params">item</span> =&gt;</span> item === <span class="keyword">this</span>.CallbackObjscts[uuid]), <span class="number">1</span>);</div><div class="line">&#125;</div></pre></td></tr></table></figure>
<h2 id="KeyUp服务代码"><a href="#KeyUp服务代码" class="headerlink" title="KeyUp服务代码"></a>KeyUp服务代码</h2><hr>
<h3 id="KeyUp-ts"><a href="#KeyUp-ts" class="headerlink" title="KeyUp.ts"></a>KeyUp.ts</h3><p>这里需要注意的是，方法中的this，默认指向KeyUp类的实例。但是，如果将这个方法提取出来单独使用，this会指向该方法运行时所在的环境，因为找不到内部的方法而导致报错。<br>一个比较简单的解决方法是，在构造方法中绑定this。</p>
<p>我们在<code>app/shared/services</code>文件夹下添加<code>KeyUp.ts</code>文件：</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div><div class="line">31</div><div class="line">32</div><div class="line">33</div><div class="line">34</div><div class="line">35</div><div class="line">36</div><div class="line">37</div><div class="line">38</div><div class="line">39</div><div class="line">40</div><div class="line">41</div><div class="line">42</div><div class="line">43</div><div class="line">44</div><div class="line">45</div><div class="line">46</div><div class="line">47</div><div class="line">48</div><div class="line">49</div><div class="line">50</div><div class="line">51</div><div class="line">52</div><div class="line">53</div><div class="line">54</div><div class="line">55</div><div class="line">56</div><div class="line">57</div><div class="line">58</div><div class="line">59</div><div class="line">60</div><div class="line">61</div><div class="line">62</div><div class="line">63</div><div class="line">64</div><div class="line">65</div><div class="line">66</div><div class="line">67</div><div class="line">68</div><div class="line">69</div><div class="line">70</div><div class="line">71</div><div class="line">72</div><div class="line">73</div><div class="line">74</div><div class="line">75</div><div class="line">76</div><div class="line">77</div><div class="line">78</div><div class="line">79</div><div class="line">80</div><div class="line">81</div><div class="line">82</div><div class="line">83</div><div class="line">84</div><div class="line">85</div><div class="line">86</div><div class="line">87</div></pre></td><td class="code"><pre><div class="line"><span class="class"><span class="keyword">class</span> <span class="title">KeyUpService</span> </span>&#123;</div><div class="line">    private CallbackObjscts: <span class="built_in">Object</span>[] = [];</div><div class="line">    private EscCallbacks: string[] = [];</div><div class="line">    private SpaceCallbacks: string[] = [];</div><div class="line">    private isEventInit: boolean = <span class="literal">false</span>;</div><div class="line"></div><div class="line">    <span class="keyword">constructor</span>() &#123;</div><div class="line">        <span class="comment">// 绑定this</span></div><div class="line">        <span class="keyword">this</span>.addEscCallback = <span class="keyword">this</span>.addEscCallback.bind(<span class="keyword">this</span>);</div><div class="line">        <span class="keyword">this</span>.addSpaceCallback = <span class="keyword">this</span>.addSpaceCallback.bind(<span class="keyword">this</span>);</div><div class="line">    &#125;</div><div class="line"></div><div class="line">    <span class="comment">// 添加Esc按键队列</span></div><div class="line">    addEscCallback(scope, callback) &#123;</div><div class="line">        <span class="keyword">this</span>.addCallback(<span class="keyword">this</span>.EscCallbacks, scope, callback);</div><div class="line">    &#125;</div><div class="line"></div><div class="line">    <span class="comment">// 添加Space按键队列</span></div><div class="line">    addSpaceCallback(scope, callback) &#123;</div><div class="line">        <span class="keyword">this</span>.addCallback(<span class="keyword">this</span>.SpaceCallbacks, scope, callback);</div><div class="line">    &#125;</div><div class="line"></div><div class="line">    <span class="comment">// 添加按键事件队列</span></div><div class="line">    private addCallback(callbacks, scope, callback) &#123;</div><div class="line">        <span class="comment">// 产生随机数</span></div><div class="line">        <span class="keyword">const</span> uuid = <span class="built_in">Math</span>.random().toString(<span class="number">36</span>).substr(<span class="number">2</span>);</div><div class="line">        <span class="comment">// 需有回调函数</span></div><div class="line">        <span class="keyword">if</span> (<span class="keyword">typeof</span> callback !== <span class="string">'function'</span>) &#123;</div><div class="line">            <span class="built_in">console</span>.log(<span class="string">'callback is not a function.'</span>);</div><div class="line">            <span class="keyword">return</span>;</div><div class="line">        &#125;</div><div class="line">        <span class="comment">// 关联uuid的作用域和回调</span></div><div class="line">        <span class="keyword">this</span>.CallbackObjscts[uuid] = &#123; scope, callback &#125;;</div><div class="line">        <span class="comment">// 添加到队列的头部</span></div><div class="line">        callbacks.unshift(uuid);</div><div class="line">        <span class="comment">// 初始化监听事件</span></div><div class="line">        <span class="keyword">if</span> (!<span class="keyword">this</span>.isEventInit) &#123;</div><div class="line">            <span class="keyword">this</span>.initEvent();</div><div class="line">            <span class="keyword">this</span>.isEventInit = <span class="literal">true</span>;</div><div class="line">        &#125;</div><div class="line">    &#125;</div><div class="line"></div><div class="line">    <span class="comment">// 执行回调队列</span></div><div class="line">    private executeCallback(callbacks) &#123;</div><div class="line">        <span class="keyword">if</span> (!callbacks.length) &#123; <span class="keyword">return</span>; &#125;</div><div class="line">        <span class="comment">// 获取队列头部uuid</span></div><div class="line">        <span class="keyword">const</span> uuid = callbacks.shift();</div><div class="line">        <span class="comment">// 取出uuid关联的作用域和回调</span></div><div class="line">        <span class="keyword">const</span> &#123;scope, callback&#125; = <span class="keyword">this</span>.CallbackObjscts[uuid] <span class="keyword">as</span> any;</div><div class="line">        <span class="comment">// 执行回调</span></div><div class="line">        scope.$apply(callback());</div><div class="line">        <span class="comment">// 移除</span></div><div class="line">        <span class="keyword">this</span>.CallbackObjscts.splice(<span class="keyword">this</span>.CallbackObjscts.findIndex(<span class="function"><span class="params">item</span> =&gt;</span> item === <span class="keyword">this</span>.CallbackObjscts[uuid]), <span class="number">1</span>);</div><div class="line">    &#125;</div><div class="line"></div><div class="line">    <span class="comment">// 监听按键事件</span></div><div class="line">    private initEvent() &#123;</div><div class="line">        <span class="keyword">const</span> that = <span class="keyword">this</span>;</div><div class="line">        <span class="comment">// 添加按键事件监听</span></div><div class="line">        <span class="built_in">document</span>.addEventListener(<span class="string">'keyup'</span>, (<span class="function">(<span class="params">e = (<span class="built_in">window</span> <span class="keyword">as</span> MyWindow</span>).<span class="params">event</span> <span class="params">as</span> <span class="params">any</span>) =&gt;</span> &#123;</div><div class="line">            <span class="keyword">if</span> (e &amp;&amp; e.keyCode) &#123;</div><div class="line">                <span class="keyword">switch</span> (e.keyCode) &#123;</div><div class="line">                    <span class="keyword">case</span> <span class="number">27</span>:</div><div class="line">                        <span class="comment">// Esc按键事件</span></div><div class="line">                        that.executeCallback(that.EscCallbacks);</div><div class="line">                        <span class="keyword">break</span>;</div><div class="line">                    <span class="keyword">case</span> <span class="number">32</span>:</div><div class="line">                        <span class="comment">// Space按键事件</span></div><div class="line">                        that.executeCallback(that.SpaceCallbacks);</div><div class="line">                        <span class="keyword">break</span>;</div><div class="line">                &#125;</div><div class="line">            &#125;</div><div class="line">        &#125;).bind(<span class="keyword">this</span>), <span class="literal">true</span>);</div><div class="line">    &#125;</div><div class="line">&#125;</div><div class="line"></div><div class="line"><span class="comment">// 新建按键服务</span></div><div class="line"><span class="keyword">const</span> KeyUp = <span class="keyword">new</span> KeyUpService();</div><div class="line"><span class="comment">// 取出Esc按键添加和Space按键添加</span></div><div class="line"><span class="keyword">const</span> &#123;addEscCallback, addSpaceCallback&#125; = KeyUp;</div><div class="line"></div><div class="line"><span class="keyword">export</span> &#123;</div><div class="line">    addEscCallback <span class="keyword">as</span> EscKeyUp,</div><div class="line">    addSpaceCallback <span class="keyword">as</span> SpaceKeyUp</div><div class="line">&#125;;</div><div class="line"></div><div class="line"><span class="keyword">export</span> <span class="keyword">default</span> KeyUp;</div></pre></td></tr></table></figure>
<h3 id="在控制器中使用"><a href="#在控制器中使用" class="headerlink" title="在控制器中使用"></a>在控制器中使用</h3><p>这里，我们为了方便，直接在登录页面进行监听：</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div></pre></td><td class="code"><pre><div class="line"><span class="keyword">import</span> &#123; EscKeyUp, SpaceKeyUp &#125; <span class="keyword">from</span> <span class="string">'../../shared/services/KeyUp'</span>;</div><div class="line"><span class="class"><span class="keyword">class</span> <span class="title">KeyUp</span></span>&#123;</div><div class="line">    <span class="keyword">constructor</span>(...)&#123;</div><div class="line">        ...</div><div class="line">        for (<span class="keyword">let</span> i = <span class="number">1</span>; i &lt;= <span class="number">3</span>; i++) &#123;</div><div class="line">            EscKeyUp($scope, () =&gt; &#123; Notify(&#123; <span class="attr">title</span>: <span class="string">`Esc按下第<span class="subst">$&#123;i&#125;</span>次注册`</span> &#125;) &#125;);</div><div class="line">            SpaceKeyUp($scope, () =&gt; &#123; Notify(&#123; <span class="attr">title</span>: <span class="string">`Space按下第<span class="subst">$&#123;i&#125;</span>次注册`</span> &#125;) &#125;);</div><div class="line">        &#125;</div><div class="line">    &#125;</div><div class="line">    ...</div><div class="line">&#125;</div></pre></td></tr></table></figure>
<p>效果图：<br><img src="https://github-imglib-1255459943.cos.ap-chengdu.myqcloud.com/1485143276%281%29.png" alt="image"></p>
<p>可见，我们后注册的事件，会先执行。</p>
<h2 id="结束语"><a href="#结束语" class="headerlink" title="结束语"></a>结束语</h2><hr>
<p>这节主要简单介绍创建一个事件队列，来监听按键，并进行回调处理的KeyUp服务，并对外提供<code>EscKeyUp()</code>和<code>SpaceKeyUp()</code>方法。当然小伙伴们也可以拓展这些按键，又或者当队列为空的时候取消事件的监听等等。<br><a href="https://github.com/godbasin/godbasin.github.io/tree/blog-codes/angular-free/9-event-callback-queue" target="_blank" rel="external">此处查看项目代码</a><br><a href="http://angular-free.godbasin.com/angular-free-9-event-callback-queue/index.html" target="_blank" rel="external">此处查看页面效果</a></p>
  
		
		<p style="margin-top:50px;">
			查看Github有更多内容噢：<a href="https://github.com/godbasin">https://github.com/godbasin</a>
			<br>
			更欢迎来<a href="https://godbasin.github.io/front-end-playground">被删的前端游乐场</a>边撸猫边学前端噢
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	<img src="https://github-imglib-1255459943.cos.ap-chengdu.myqcloud.com/2code2.jpg" width="200" height="200" style="display:block;margin: 0 auto;" />
	<p style="text-align: center;margin-top: 10px;margin-bottom: 20px;">码生艰难，写文不易，给我家猪囤点猫粮了喵~</p>
	<div class="author-right">
  		<p>作者：被删</p>
  		<p>出处：<a href="https://godbasin.github.io">https://godbasin.github.io</a></p>
  		<p>本文版权归作者所有，欢迎转载，但未经作者同意必须保留此段声明，且在文章页面明显位置给出原文连接，否则保留追究法律责任的权利。</p>
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  <strong class="toc-title">文章目录</strong>
  <ol class="toc"><li class="toc-item toc-level-2"><a class="toc-link" href="#基本思路"><span class="toc-number">1.</span> <span class="toc-text">基本思路</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#提供队列注册事件"><span class="toc-number">1.1.</span> <span class="toc-text">提供队列注册事件</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#注册监听事件"><span class="toc-number">1.2.</span> <span class="toc-text">注册监听事件</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#执行回调，并销毁注册"><span class="toc-number">1.3.</span> <span class="toc-text">执行回调，并销毁注册</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#KeyUp服务代码"><span class="toc-number">2.</span> <span class="toc-text">KeyUp服务代码</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#KeyUp-ts"><span class="toc-number">2.1.</span> <span class="toc-text">KeyUp.ts</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#在控制器中使用"><span class="toc-number">2.2.</span> <span class="toc-text">在控制器中使用</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#结束语"><span class="toc-number">3.</span> <span class="toc-text">结束语</span></a></li></ol>
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